<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .d1 {
            width:200px;
            height:200px;
            background-color: #0aa1ed;
            border-bottom: 9px dotted #f0f;
            border: 5px solid #f00;
            border-radius: 200px;
        }
        .d2{
            width: 200px;
            height: 60px;
            background-color: cyan;
           border-radius: 30px;
        }
        .d2{
            width: 200px;
            height: 100px;
            background-color: purple;
            border-radius: 100px/50px;
        }
        .d4{
            width:200px;
            height:200px;
            background-color: cyan;
            border: 10px solid #00f;
            padding-left: 50px;
            margin: 50px;
            box-sizing: border-box;
        }
        span {
            background-color: #ff0;
            padding:50px;
        }
    </style>
</head>
<body>
<div class="d1"></div>
<div class="d2"></div>
<div class="d3"></div>
<div class="d4">内间距测试</div>
<span>span1</span><span class="s2">span2</span><span>span3</span>
<h1>哈利波特哈利不哈利</h1>

</body>
</html>